Process for stirring up farinaceous materials in receptacles of any kind by compressed air, compressed gas, or the like



Aug. 28, 1934. P GQEBELS 1,971,852 PROCESS FOR STIRRING UP FARINACEoUsMATERIALS IN REGEPTACLES 0F ANY KIND BY COMPRESSED AIR, CoMPREssED GAS,0R THE LIKE Filed June l, 1932 2 Sheets-Sheetl 1 f5.1 ff 1^ L I 7 f "0Rf f 7 t alg i Iwsnfom KAL V@Y Auxwrmwffm Aug. 28, 1934. P, GO ELS1,971,852

PROC

ESS FOR STIRRING UP FAR CEO MATERIALS IN RECEPTACLES OF ANY KIND BYCOMPRESSED COMPRESSED GAS, OR THE LIK Filed June l, 1952 2 She -Sheeb 2--Psfented uNlTslil sTATss y 1,971.85: raocns's Fon -srmamc UrrAamAcaoUs maremma nv nacmaoms or PATENT OFFICE ANY KIND-BY COMPRESSEDAIR, COMPRESSED Gas, oa 'rim una nur Gwa'nmu, Germany, maar a the .firmG, Polyslus. Aktiengesellschaft, Dessau,

y' application June 1. 1932, serai No. 614,825

In Germany June 3, 1931 8 Claims. (Cl. 259-4) V This invention relatesto the storage and handling of nely divided materials, for instancecement, coal dust, or farinaceous material, and the principal object ofthe invention is the provi- V I sion of means to facilitate thedischarge of such other conditions the angle of repose of the materialmay cause a considerable proportion to collect adjacent the outlet andpartially obstruct the flow.

This difliculty, which is particularly objectionable where uniform iiowis necessary, for instance where different kinds of iiour from severalreceptacles are to be mixed or in the discharge of coal dust or othercombustible material into a burner, cannot be entirely obviated by theprovision of mechanical stirring devices since such devices invariablyresult in a discharge which is less uniform than that which is obtainedby gravity when the material isflowing `freely through the outlet.

It is a feature of the invention that a gaseous material, for instanceair, is introduced under pressure in the receptacle in such manner as toprevent the powdered material from .adhering to the receptacle walls orto prevent the development of a static condition in any particularportion of the material within the receptacle.

provide in a receptacle for the storage of powdered materials a liningspacedv from the receptacle wall and preferably adjacent the receptacleoutlet whereby a pocket or passage is formed in which a gaseous mediumunder pressure may be introduced, the lining being pervious to' thegaseous medium` so that the latter may enter the receptacle over aconsiderable area of the receptacle For this purpose the air isintroduced into thev wall as distinguished from an arrangement employinga nozzle for causing simple circulation of the air within thereceptacle, By this means a sheet or blanket of air may be establishedon the inner surface of the porous lining which definitely prevents thepowdered particles from adhering to the lining. A

Alternatively, the gas-pervious surface may be independent of thereceptacle wall and may be so disposed within the receptacle that thematerial is kept in motion at such points as are deemed necessary toensure uniform discharge of the material.

Further objects and features of the invention will be apparent from thefollowing description taken in connection with the accompanyingdrawings, in which Figure l is a vertical sectional view of a receptacleillustrating one embodiment of the present invention;

Figure 2 is a vertical sectional view illustrating the application ofthe invention to a receptacle of different type; A

Figure 3 is a horizontal section on the line A-B of Figure 2;

Figure 4 is a vertical sectional view of a re-V ceptacle showing aslightly modified form df the invention;

Figure 5 is an enlarged fragmentary view of a portion of the receptacleshown in Figure 4;

Figure 6 is a further enlargement of a fragmentary portion of thereceptacle; and

Figure 'l is a vertical sectional view through one of the elements shownin Fig. 4.

Referring more particularly to the drawings, it will be observed thatFigure 1 discloses a silo or other receptacle 1 provided with an inlet 2through which the finely divided material may be introduced, an outlet 3through which the material is discharged, and a stack or iiue 4 throughwhich the air or other gaseous medium introduced in the receptacle maybe discharged. It will be understood that the usual control means suchas a valve may be provided at the outlet 3 to regulate the discharge ofthe material from the receptacle.

' It vwill be observed that the receptacle illustrated is substantiallyrectagular in vertical cross-section and in this type of receptacle thematerial tends to collect at the lower corners and eventually thedischarge of the material is either impeded or entirely prevented. Inorder to obviate this 'difficulty means are provided for introducing thegaseous medium over at least a portion of the interior surface of thereceptacle,

for instance adjacent the lower corners,'and in the drawings this meansis shown as extending over the entire lower wall and side walls of thereceptacle. For this purpose a porous inner lining 8 is provided, thislining being conveniently formed of relatively small sections securedtogether in any suitable manner and supported in spaced relation to theinner wall of the receptacle 1 to provide a passage for the gaseousmedium therebetween. In the arrangement shown in the drawings a lining14 is secured against the inner wall of the receptacle, and the porouslining 8'is supported in spaced relation to this inner lining 14,although it will be appreciated that the latter may be dispensed with ifdesired. The passage 5 thus provided is in communication with a conduit6 for conducting air under pressure thereto, there being as many ofthese conduits provided as are necessary to ensure uniform distributionof the air throughout the passage 5 and to supply each section of thepassage 5 in the event separate sections are formed, for instance, atthe bottom and at the side walls of the receptacle as shown in Figure 1.

Preferably the passage 5 is subdivided into numerous sections, forinstance by the provision of partitions 9 as illustrated moreparticularly in Figures 5 and 6 of the drawings, a separate conduit 6.being provided for each of these sections so that the pressure of theair supplied to each section may be independently regulated by means ofa control valve I allocated to each conduit.

It will be observed that by this construction the gaseous medium isintroduced under pressure over a very substantial area of the interiorof f the receptacle and that in eiect a wall or blanket of air underpressure is formed over this surface.

In the event the receptacle is of the type shown in Figure 2 employing adownwardly tapering discharge s'pout, it may be found necessary toemploy 4the inner lining of porous material 8 over the wall of the spoutonly, The porous material may be formed of various substances or may beso constructed as to render it pervious to gas under pressure. Thus itmay be formed of filter stone, porous brick, porous caoutchouc, or thelike or of any material having a multiplicity of perforations oropenings therein.

Referring now to Figure 4 of the drawings, it will be observed that .thegas-pervious lining hereinbefore referred to for the receptacle wallsmay be replaced by or the effect of such a lining may be augmented bythe introduction into the receptacle of a plurality of conduits 10 forsupplying the gaseous medium under pressure to the associated drums 12,the latter having a very considerable area and being formed so as to bepervious to air as hereinbefore described. These drums 12 may be locatedat any convenient point in the receptacle, and preferably Where theywill contact with the material stored within the receptacle and in suchmanner as to maintain portions of the material in a state of movement;

The flow of air under pressure to each of the drums 12 is preferablycontrolled by a separate valve 11 so that the movement of the materialwithin the receptacle may be regulated as appears necessary in order toensure uniform discharge through the outlet opening. In addition to thefeatures hereinbefore indicated, the apparatus may be utilized to effectdesired physical or chemical changes in the material in the receptacle.For instance, cement stored in a receptacle of this character may beripened by forcing a gaseous medium including carbonic acid gas throughthe porous lining, the` finely divided condition of the gas as itemerges from the porous substance facilitating reaction with the cement.

It will be observed that this invention does not depend primarily on themaintenance of a complete circulation of air within the receptacle suchthe arrangement described herein applies pressure to the material storedover a very considerable area to prevent any development of a staticcondition of any considerable quantity of theC material.

Various modifications of the construction illustrated in the drawingsand described specifically herein may be made without departing from thespirit and scope of the invention as defined in the appended claims.

Having thus described the invention, what is claimed as new and desiredto be secured by Letters Patent is:

1. In apparatus forstoring and discharging finely divided material, thecombination with a receptacle for the material provided with a dischargeoutlet, of means associated with the receptacle for introducing thereina gaseous medium under pressure at a multiplicity of spaced points, saidmeans including a passage for the gaseous medium having a wall of porousmaterial 'disposed within the receptacle.

2. In apparatus for storing and discharging finely divided material, thecombination with a receptacle for the material provided with a dischargeoutlet, of means associated with the receptacle for introducing thereina gaseous medium under pressure at a multiplicity of spaced points, saidmeans including a lining of porous material for the receptacle disposedadjacent the receptacle outlet, and means for passing the gaseous mediumthrough the said lining.

3. In apparatus for storing and discharging finely divided material, thecombination with a receptacle for the material provided with a dischargeoutlet, said receptacle having a wall of gas pervious material on whichthe finely divided material normally rests, of means for forcing agaseous medium through said wall to prevent adhesion of the finelydivided material to the said wall.

4. In apparatus for storing and discharging finely divided material, thecombination with a receptacle for the material, said receptacle having adischarge outlet in the lower portion thereof, of means forming a liningof porous material in the lower portion of said receptacle, and meansfor directing a gaseous medium through said lining.

5. In apparatus for storing and discharging finely divided material, thecombination with a receptacle for the material, said receptaclehaving adischarge outlet, of a lining for a portion of the interior ofthereceptacle spaced from the receptacle Walls to form a passagetherebetween, said lining being formed of material pervious to gas, andmeans for introducing a gaseous medium under pressure in said passage.

6. In apparatus for storing and discharging nely divided material, thecombination with a receptacle for the material, said receptacle having adischarge outlet, of a lining for a portionof the interior of thereceptacle spaced from the receptacle walls to form a passagetherebetween, said lining being formed of material pervious to gas,partitions between said lining and the neceptacle walls for separatingthe passage thus formed into separate sections, separate conduits forconducting a gaseous medium into each of said sections, and a controlvalve associated with each conduit.

'1. In apparatus for agitating Aand conveying nnely divided material,the combination with a passage having a material inlet and a materialdischarge outlet, said e having a wall on which the material may restformed largely of porous material. and means for introducing a gaseousmedium into said passage through said porous wall to ensure movement ofthe material in said passage toward the said discharge outlet.

8. In apparatus for agitating and conveying iinely divided material, thecombination with a conduit comprising an outer shell and an inner liningformed oi porous material on which the material may rest, said shell andinner lining being spaced to deiine therebetween a passage isolated iromsaid 'material except for the porosity of said lining, and means i'orintroducing a gaseous medium under presure in said passage, whereby saidmedium may ilow through said lining and maintain said material inmotion.

PAUL GOEBELS.

